Wave-packet propagation method for the quantum-confined Stark effect in coupled double quantum wells (Invited Paper)

Milton O. Vassell; Johnson Lee

doi:10.1117/12.60472

1 July 1992 Wave-packet propagation method for the quantum-confined Stark effect in coupled double quantum wells (Invited Paper)

Milton O. Vassell, Johnson Lee

Author Affiliations +

Proceedings Volume 1679, Physics and Simulation of Optoelectronic Devices; (1992) https://doi.org/10.1117/12.60472
Event: Semiconductors '92, 1992, Somerset, NJ, United States

Abstract

A wavepacket propagation method is presented for analyzing perpendicular-field electroabsorption in quantum wells. The method evolves the pair envelope wavefunction for electrons and holes under Coulomb interaction and an applied electric field by a split-step algorithm. The power of the method is demonstrated by calculating ground-state properties, excitonic spectra, and certain features of electron-hole quantum dynamics in coupled double quantum wells (CDQW). First, an initial wavefunction tailored to the ground state is evolved in imaginary time and used to compute pair energies, exciton binding energies, and pair probability distributions. Second, an initial wavepacket tailored to the absorption spectrum is evolved in real time and used to record autocorrelation functions, mean positions of electrons and holes, and the excitonic spectra from the Fourier transform of the autocorrelation function. It is shown that the experimentally observed characteristics of the quantum-confined Stark effect are reproduced, and that significant migration of carriers occurs during the formation of the field-induced dipole moment.

Citation Download Citation

Milton O. Vassell and Johnson Lee "Wave-packet propagation method for the quantum-confined Stark effect in coupled double quantum wells (Invited Paper)", Proc. SPIE 1679, Physics and Simulation of Optoelectronic Devices, (1 July 1992); https://doi.org/10.1117/12.60472

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